JAJSE21B October 2017 – November 2018
PRODUCTION DATA.
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The bq24079QW-Q1 uses the VIN-DPM mode for operation from current-limited USB ports. When EN1 and EN2 are configured for USB100 (EN2 = 0, EN1 = 0) or USB500 (EN2 = 0, EN2 = 1) modes, the input voltage is monitored. If VIN falls to VIN-DPM, the input current limit is reduced to prevent the input voltage from falling further. This prevents the bq24079QW-Q1 from crashing poorly designed or incorrectly configured USB sources. Figure 21 shows the VIN-DPM behavior to a current limited source. In this figure, the input source has a 400-mA current limit and the device is in USB500 mode (EN1 = 1, EN2 = 0).